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Parton

About: Parton is a research topic. Over the lifetime, 13484 publications have been published within this topic receiving 368877 citations.


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TL;DR: In this article, the authors developed the concept of quantum phase-space (Wigner) distributions for quarks and gluons in the proton and analyzed the contraints from special relativity on the interpretation of elastic form factors.
Abstract: We develop the concept of quantum phase-space (Wigner) distributions for quarks and gluons in the proton. To appreciate their physical content, we analyze the contraints from special relativity on the interpretation of elastic form factors, and examine the physics of the Feynman parton distributions in the proton's rest frame. We relate the quark Wigner functions to the transverse-momentum dependent parton distributions and generalized parton distributions, emphasizing the physical role of the skewness parameter. We show that the Wigner functions allow us to visualize quantum quarks and gluons using the language of classical phase space. We present two examples of the quark Wigner distributions and point out some model-independent features.

255 citations

Journal ArticleDOI
TL;DR: In this paper, the leading order amplitudes for exclusive photon and meson electroproduction reactions at large values of the valence region were estimated in terms of skewed quark distributions.
Abstract: We estimate the leading order amplitudes for exclusive photon and meson electroproduction reactions at large ${Q}^{2}$ in the valence region in terms of skewed quark distributions. As experimental investigations can currently only be envisaged at moderate values of ${Q}^{2},$ we estimate power corrections due to the intrinsic transverse momentum of the partons in the meson wave function and in the nucleon. To this aim, the skewed parton distribution formalism is generalized so as to include the parton intrinsic transverse momentum dependence. Furthermore, for the meson electroproduction reactions, we calculate the soft overlap type contributions and compare them with the leading order amplitudes. We give first estimates for these different power corrections in kinematics which are relevant for experiments in the near future.

255 citations

Journal ArticleDOI
TL;DR: In this article, the matrix elements squared for all (2 → 2) and (2→ 3) parton scattering subprocesses calculated at O(αs3) were presented in n dimensions to regulate singularities due to the emission of soft or collinear radiation.

254 citations

Journal ArticleDOI
A. Adare1, C. A. Aidala2, C. A. Aidala3, N. N. Ajitanand4  +384 moreInstitutions (56)
TL;DR: Measurements of azimuthal dihadron correlations near midrapidity in d+Au collisions at RHIC and the LHC complement recent analyses by experiments involving central p+Pb collisions at √(s(NN))=5.02 TeV, which have indicated strong anisotropic long-range correlations in angular distributions of hadron pairs.
Abstract: The PHENIX collaboration at the Relativistic Heavy Ion Collider (RHIC) reports measurements of azimuthal dihadron correlations near midrapidity in d + Au collisions at root s(NN) = 200 GeV. These measurements complement recent analyses by experiments at the Large Hadron Collider (LHC) involving central p + Pb collisions at root s(NN) = 5.02 TeV, which have indicated strong anisotropic long-range correlations in angular distributions of hadron pairs. The origin of these anisotropies is currently unknown. Various competing explanations include parton saturation and hydrodynamic flow. We observe qualitatively similar, but larger, anisotropies in d + Au collisions at RHIC compared to those seen in p + Pb collisions at the LHC. The larger extracted upsilon(2) values in d + Au are consistent with expectations from hydrodynamic calculations owing to the larger expected initial-state eccentricity compared with that from p + Pb collisions. When both are divided by an estimate of the initial-state eccentricity the scaled anisotropies follow a common trend with multiplicity that may extend to heavy ion data at RHIC and the LHC, where the anisotropies are widely thought to arise from hydrodynamic flow.

254 citations

Journal ArticleDOI
TL;DR: In this paper, the authors studied the deviations to be expected at high energies from the recently observed two-jet structure of hadronic final states in e + e − annihilation, and suggested that hard gluon bremsstrahlung may be the dominant source of hadrons with large momenta transverse to the main jet axes.

253 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023384
2022897
2021410
2020423
2019472
2018424